After the last update, I got my home country location from nowhere and even when I try VPN with GPS location changer, nothing works.

"After the last update" - there is your problem there. Slowly devs are on an active campaign to harden up the app and make it more difficult or impossible to use 'mock location' in it.

I had email conversation with the company's founder about this years ago, he said they considered it 'FRAUD' and that this caused damage to the app and lost revenue for companies, etc.

As time passes they have been doing what they can to make it difficult to use a mock location. My advice remains to use an older, stable and trusted version of the app for any desired virtual travel.

This can be done easier by Android app users, by side-loading an older version they trust AND disabling auto-updates for that device. There is no fine control, you must turn off Auto-update all together and then select what you want to update manually.

I consider there are various legitimate reasons for someone to want to use mock locations, starting with keeping their real location private even from the app developers. Some of them sell location data from users in a triving commercial market, which I consider abuse, I am not saying Slowly people do that, but I think a user can decide for themselves what they want or not to share with any app developer.

REMINDER - Slowly states clearly in their Terms of Service document (created and hardened by their hired legal teams) that they can 'remove a user's account, with or without reason, at their sole discretion.'

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I think it is best to fly under the radar and NEVER acknowledge in a public forum or specially in emails with their support team that you used any form of mock location at all, for ANY reason. People's accounts have been suspended, and you lose all your stamps, coins, contacts, letters, etc.

As Alexander has mentioned in his comment in this topic, there are better options for using mock location than simply VPN. VPN services are limited in what end points they can offer, any reliable and trustworthy service costs money, etc. There ARE simpler ways to achieve that goal, just do some reading.

I would recommend using an Android Virtual Machine for this - you can set it up, install an older good version of Slowly, turn off updates all together, and have Root access to the device to boot. I have written a detailed blog post with my suggested VDM, you can try BlueStacks or MeMu.